\begin{tabular}[b]{c|c|c}
&\begin{tikzpicture} \draw[->,very thick] (0,.5) -- (.5,0); \end{tikzpicture} & \begin{tikzpicture} \draw[->,very thick] (0,0) -- (.5,.5); \end{tikzpicture}
\\\hline
\begin{tikzpicture} \draw[->,very thick] (0,.5) -- (.5,0); \end{tikzpicture} \begin{tikzpicture} \draw[->,very thick] (0,.5) -- (.5,0); \end{tikzpicture} &
\begin{tabular}[t]{ll}
\pbox{20cm}{80\% \\ $\mu$: -6\% \\ N: 9612}
&\scalebox{.25}{\input{hist/m2-s1-1.tex}}
\end{tabular}
&
\begin{tabular}[t]{ll}
\pbox{20cm}{20\% \\ $\mu$: 29\% \\ N: 2367}
&\scalebox{.25}{\input{hist/m2-s1-2.tex}}
\end{tabular}
\\\hline
\begin{tikzpicture} \draw[->,very thick] (0,0) -- (.5,.5); \end{tikzpicture} \begin{tikzpicture} \draw[->,very thick] (0,.5) -- (.5,0); \end{tikzpicture} &
\begin{tabular}[t]{ll}
\pbox{20cm}{50\% \\ $\mu$: -12\% \\ N: 1674}
&\scalebox{.25}{\input{hist/m2-s2-1.tex}}
\end{tabular}
&
\begin{tabular}[t]{ll}
\pbox{20cm}{50\% \\ $\mu$: 65\% \\ N: 1654}
&\scalebox{.25}{\input{hist/m2-s2-2.tex}}
\end{tabular}
\\\hline
\begin{tikzpicture} \draw[->,very thick] (0,.5) -- (.5,0); \end{tikzpicture} \begin{tikzpicture} \draw[->,very thick] (0,0) -- (.5,.5); \end{tikzpicture} &
\begin{tabular}[t]{ll}
\pbox{20cm}{71\% \\ $\mu$: -13\% \\ N: 2367}
&\scalebox{.25}{\input{hist/m2-s3-1.tex}}
\end{tabular}
&
\begin{tabular}[t]{ll}
\pbox{20cm}{29\% \\ $\mu$: 48\% \\ N: 960}
&\scalebox{.25}{\input{hist/m2-s3-2.tex}}
\end{tabular}
\\\hline
\begin{tikzpicture} \draw[->,very thick] (0,0) -- (.5,.5); \end{tikzpicture} \begin{tikzpicture} \draw[->,very thick] (0,0) -- (.5,.5); \end{tikzpicture} &
\begin{tabular}[t]{ll}
\pbox{20cm}{50\% \\ $\mu$: -19\% \\ N: 1653}
&\scalebox{.25}{\input{hist/m2-s4-1.tex}}
\end{tabular}
&
\begin{tabular}[t]{ll}
\pbox{20cm}{50\% \\ $\mu$: 50\% \\ N: 1623}
&\scalebox{.25}{\input{hist/m2-s4-2.tex}}
\end{tabular}
\end{tabular}
